File size: 4,777 Bytes
0f90f73 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 |
import torch
import torch.nn as nn
import torchvision.models as models
class PerceptualLoss(nn.Module):
r"""
Perceptual loss, VGG-based
https://arxiv.org/abs/1603.08155
https://github.com/dxyang/StyleTransfer/blob/master/utils.py
"""
def __init__(self, weights=[1.0, 1.0, 1.0, 1.0, 1.0]):
super(PerceptualLoss, self).__init__()
self.add_module('vgg', VGG19())
self.criterion = torch.nn.L1Loss()
self.weights = weights
def __call__(self, x, y):
# Compute features
x_vgg, y_vgg = self.vgg(x), self.vgg(y)
content_loss = 0.0
content_loss += self.weights[0] * self.criterion(x_vgg['relu1_1'], y_vgg['relu1_1'])
content_loss += self.weights[1] * self.criterion(x_vgg['relu2_1'], y_vgg['relu2_1'])
content_loss += self.weights[2] * self.criterion(x_vgg['relu3_1'], y_vgg['relu3_1'])
content_loss += self.weights[3] * self.criterion(x_vgg['relu4_1'], y_vgg['relu4_1'])
content_loss += self.weights[4] * self.criterion(x_vgg['relu5_1'], y_vgg['relu5_1'])
return content_loss
class VGG19(torch.nn.Module):
def __init__(self):
super(VGG19, self).__init__()
features = models.vgg19(pretrained=True).features
self.relu1_1 = torch.nn.Sequential()
self.relu1_2 = torch.nn.Sequential()
self.relu2_1 = torch.nn.Sequential()
self.relu2_2 = torch.nn.Sequential()
self.relu3_1 = torch.nn.Sequential()
self.relu3_2 = torch.nn.Sequential()
self.relu3_3 = torch.nn.Sequential()
self.relu3_4 = torch.nn.Sequential()
self.relu4_1 = torch.nn.Sequential()
self.relu4_2 = torch.nn.Sequential()
self.relu4_3 = torch.nn.Sequential()
self.relu4_4 = torch.nn.Sequential()
self.relu5_1 = torch.nn.Sequential()
self.relu5_2 = torch.nn.Sequential()
self.relu5_3 = torch.nn.Sequential()
self.relu5_4 = torch.nn.Sequential()
for x in range(2):
self.relu1_1.add_module(str(x), features[x])
for x in range(2, 4):
self.relu1_2.add_module(str(x), features[x])
for x in range(4, 7):
self.relu2_1.add_module(str(x), features[x])
for x in range(7, 9):
self.relu2_2.add_module(str(x), features[x])
for x in range(9, 12):
self.relu3_1.add_module(str(x), features[x])
for x in range(12, 14):
self.relu3_2.add_module(str(x), features[x])
for x in range(14, 16):
self.relu3_2.add_module(str(x), features[x])
for x in range(16, 18):
self.relu3_4.add_module(str(x), features[x])
for x in range(18, 21):
self.relu4_1.add_module(str(x), features[x])
for x in range(21, 23):
self.relu4_2.add_module(str(x), features[x])
for x in range(23, 25):
self.relu4_3.add_module(str(x), features[x])
for x in range(25, 27):
self.relu4_4.add_module(str(x), features[x])
for x in range(27, 30):
self.relu5_1.add_module(str(x), features[x])
for x in range(30, 32):
self.relu5_2.add_module(str(x), features[x])
for x in range(32, 34):
self.relu5_3.add_module(str(x), features[x])
for x in range(34, 36):
self.relu5_4.add_module(str(x), features[x])
# don't need the gradients, just want the features
for param in self.parameters():
param.requires_grad = False
def forward(self, x):
relu1_1 = self.relu1_1(x)
relu1_2 = self.relu1_2(relu1_1)
relu2_1 = self.relu2_1(relu1_2)
relu2_2 = self.relu2_2(relu2_1)
relu3_1 = self.relu3_1(relu2_2)
relu3_2 = self.relu3_2(relu3_1)
relu3_3 = self.relu3_3(relu3_2)
relu3_4 = self.relu3_4(relu3_3)
relu4_1 = self.relu4_1(relu3_4)
relu4_2 = self.relu4_2(relu4_1)
relu4_3 = self.relu4_3(relu4_2)
relu4_4 = self.relu4_4(relu4_3)
relu5_1 = self.relu5_1(relu4_4)
relu5_2 = self.relu5_2(relu5_1)
relu5_3 = self.relu5_3(relu5_2)
relu5_4 = self.relu5_4(relu5_3)
out = {
'relu1_1': relu1_1,
'relu1_2': relu1_2,
'relu2_1': relu2_1,
'relu2_2': relu2_2,
'relu3_1': relu3_1,
'relu3_2': relu3_2,
'relu3_3': relu3_3,
'relu3_4': relu3_4,
'relu4_1': relu4_1,
'relu4_2': relu4_2,
'relu4_3': relu4_3,
'relu4_4': relu4_4,
'relu5_1': relu5_1,
'relu5_2': relu5_2,
'relu5_3': relu5_3,
'relu5_4': relu5_4,
}
return out
|